US 6969284 B2
A plug connector device (11, FIG. 2) for medium voltage (e.g. 220 volts) compact servomotors has a power plug unit (16) and a control signal plug unit (17), each with connectable/disconnectable outer and inner plugs (49,48 and 52,51), the units lying in a single connector housing that is supported around a wire-passing aperture (14) in a motor housing part (13) and that pivots to different angular positions.
1. A servo motor system which receives electrical power and control signals through power and signal wires that extend through a wire-passing aperture with a vertical axis formed in a motor housing, including:
a connector housing which has upper and lower shells, said lower shell including an inner end portion with walls forming a shell opening, said inner end portion being connected to said motor housing with said shell opening aligned with said wire-passing aperture in said motor housing;
power and control cables that each has individual conductors;
a pair of outer plugs including an outer power plug with contacts connected to conductors of said power cable, and an outer signal plug with contacts connected to conductors of said signal cable;
a pair of inner plugs that include an inner power plug with contacts connected to said power wires and an inner signal plug with contacts connected to said signal wires;
said outer and inner plugs lie in said connector housing, and said connector housing has walls that fix the positions of said plugs with their contacts mated to contacts of a corresponding plug;
an adaptor on said motor housing, said adaptor having walls forming an adaptor bore that is aligned with said wire aperture;
said inner end portion of said lower shell has a tubular part that forms said shell opening and that fits into said adaptor bore, said tubular part forming an upwardly-facing shoulder;
a fastener that detachably engages said adaptor and said upwardly-facing shoulder to detachably hold together said lower shell and adaptor.
2. The system described in
said adaptor has a pair of radially-inwardly extending projections at one side of said adaptor bore and has a threaded hole at an opposite side of said adaptor bore;
said shell opening walls form a radially outwardly-extending flange at a lower end thereof; and including
a screw that extends through said threaded hole and that engages said shell opening walls above said flange.
3. The system described in
said shell opening walls and said adaptor bore walls are each circular and each has a partially circular groove therein, with walls of the adaptor having three slots at the bottom of its groove;
a clip of resilient metal which lies in the adaptor groove and which has three radially inward projections that project through said slots into the groove of the shell opening walls.
4. The system described in
said groove in said shell opening wall has a plurality of recesses, and said clip has a projection that engages one of said recesses at each of a plurality of rotational positions of said shell opening wall about said axis.
5. A plug connector device for a compact servomotor, having a power plug unit, and a control signal plug unit, both supported on a motor housing around an axis of a motor aperture, and each plug unit having pin and socket plugs that can be detachably plugged into each other, wherein:
the plug units are accommodated in a connector housing, which at its one end is supported on the motor housing and on its other end accepts a power cable and a separate control signal cable that are respectively connected to one of the plugs of a corresponding one of said plug units;
said connector housing being fixable on the motor housing part in any of a plurality of preset angular positions.
6. The system described in
said connector housing has a connector wall and said motor housing has a motor wall that surrounds said connector wall, said motor wall having groove and a plurality of slots at the bottom of its groove and said connector wall having tooth-receiving recesses;
a clip of resilient metal which lies in said groove, the clip having a plurality of radially inward projections that project into said slots, and the clip having a tooth that projects through one of said slots and engages one of said tooth-receiving recesses.
Current compact medium voltage (e.g. 220 volts) servomotors are connected to two separate pin-and-socket type connectors, one for power and the other for control signals. The two connectors which are separately mounted, occupy considerable space, especially compared to the compact servomotor itself. It has been suggested that the two connectors be arranged coaxially, but this would add considerable expense. A low cost and compact connector arrangement that connected power and control signal cable conductors to corresponding wires of a compact servomotor, using separate mateable plugs for isolation, would be of value. It also would be of value if the cables could extend in any of a plurality of directions from the motor.
In accordance with one embodiment of the invention, a compact and angularly adjustable servomotor system is provided that receives power and signal currents though wires extending though a wire-passing aperture in the motor housing, such currents passing though corresponding power and control signal cables and mateable connectors to the wires. The system includes a connector housing that has an inner end portion with an opening that is aligned with the wire aperture in the motor housing. The housing also has an outer end portion into which power and control signal cables extend. The shell holds mating pin-and-socket type inner and outer plugs of both a power plug unit and a control signal plug unit. The shell includes upper and lower metal shell parts that can be separated to install, remove, connect, and disconnect the plugs, and the shell halves then can be held together.
The shell is mounted on the motor housing so the shell can be pivoted to a selected position about the vertical axis of the wire-passing aperture in the motor housing, to allow the cables to extend in a desired horizontal direction from the shell. In one system, an adaptor is mounted on the motor housing and has an adaptor bore aligned with the wire-passing aperture. The lower shell half has a tubular portion that extends down into the adaptor bore. The tubular portion has a radially-outward flange at its lower end. A screw that extends though a threaded hole in the adaptor, has a screw end that moves over the flange to trap the shell in place on the adaptor and motor housing. The screw can be loosened slightly so the shell can be turned about the axis to extend in a desired direction, with the screw then tightened again to fix the direction.
In another system, screw holes are formed in the motor housing around the wire-passing aperture. The inner end of the lower shell has corresponding screw holes, so the shell can be fixed to the motor housing by screws. The screw holes are uniformly angularly spaced about the wire passing aperture, so the shell can be fastened at any one of a plurality of angular positions.
In another design, a clip ring is used to fasten a downwardly-extending tubular portion of the inner end of the lower housing shell to an adaptor mounted on the motor housing. The clip ring is installed in an adaptor groove. Radially inward projections of the clip ring pass through slots in the adaptor groove and enter portions of a groove in the tubular portion of the lower shell half. The clip ring has a projection that holds the shell in a selected angular position.
The novel features of the invention are set forth with particularity in the appended claims. The invention will be best understood from the following description when read in conjunction with the accompanying drawings.
A power plug unit 16 and a control signal plug unit 17 lie in the connector housing 15. The power plug unit 16 includes inner and outer power plugs 48, 49 that connect by engagement of pin and socket contacts of the plugs. Similarly, the control signal plug unit 17 includes inner and outer control signal plugs 51, 52 with pin and socket contacts.
The motor housing 13 shown in
As shown in
As shown in
The inner groove 306, which lies on the tubular part that extends from the lower shell, has a plurality of indentations, shown at 320 in
In accordance with
Adapter 12 has the shape of a roughly square, flat disk that is furnished with through bore hole 19, the disk in the exemplary embodiment depicted being attached by four screws 21 to an exterior surface 22 of motor housing part 13. It is obvious that adapter 12 can also be molded on motor housing part 13. Adapter 12, which occupies a significant portion of relevant exterior surface 22 of motor housing part 13, is provided on the interior circumference of through bore hole 19 with two radial projections 23 and 24, whose radial interior surfaces are also circular. Two radial projections 23 and 24 are spaced at an acute angle with respect to the radius of the bore hole; in addition, they are relatively narrow. Their width is less than the axial dimensions of the interior circumference of through bore hole 19 and of the width of adapter 12, their surfaces aligning with the surface of the adapter. A fixing screw 26 in the form of a setscrew is radially introduced so as to be able to be screwed in and out from outside and is situated roughly diametrically opposite two adjoining radial projections 23 and 24, i.e., from their midpoint.
Connector housing 15 is in two parts, i.e., it is composed of a lower shell 28 and a cover shell 29, cover shell 29 being able to be detachably screwed onto lower shell 28. Facing away from cover shell 29, lower shell 28 around its bushing 18 has an annular projection 31, which is provided with an annular undercut 32 (
Lower shell 28 of connector housing 15 has an elongated shape that is rounded in front and rectangular in the rear, as can be seen in
Lower shell 28 of connector housing 15, which is molded out of plastic and/or metal, is provided with a shielding separating wall 43 in the longitudinal direction and, on both sides of this shielding separating wall 43 in two receiving spaces 44 and 45 thus remaining, with front and rear fixing projections 46 and 47. Into these receiving spaces 44 and 45, first plug connector unit 16 and second plug connector unit 17 are inserted and supported (
First and second plug connector units 16 and 17 are mounted within the connector housing 15 in the following manner. If the undepicted wires leading from the servomotor are pulled out through bushing 14 in motor housing part 13, they can be joined to socket plug 48 of first plug connector unit 16 and to socket plug 51 of second plug connector unit 17. It is obvious that in this state, adapter 12 is already mounted and the wires are led out through adapter 12. It is then possible to fixedly connect these wires to socket plug 48, 51. Thereafter, socket plugs 48 and 51, in sequence, are pushed through sufficiently large bushing 18 of connector housing 15, i.e., from its lower shell 28. After pin plugs 49, 52 are connected to the wires of relevant cables 38, 39, the former are connected to respective socket plugs. 48, 51 and are introduced into the above-mentioned receptacle spaces 44, 45. In this assembly step or in a preceding one, lower shell 28 can be joined to adapter 12 in the manner depicted above. Thereafter, according to
In the exemplary embodiment depicted in
In the second exemplary embodiment, depicted in
In this connector housing 115, lower sh-ell 128 provides space for a total of four plug connector units 116, 117, 117′ and 117″, which are joined to two cables 138 and 139 at the input side. Whereas in the first exemplary embodiment in addition to plug connector unit 16 (here 116) for the voltage supply only one plug connector unit 17 was provided for the signal lead, in this second exemplary embodiment three plug connector units 117, 117′, 117″ are provided for the signal lead. Cover shell 129 is provided with a seal 171. In addition, cable clamps 141 and 142 are moved within lower shell 128, whereas on the exterior side guideway half shells 172 and 173 are provided, which support cables 138, 139 using crimping sleeves 174 and rubber seals 175.
A further difference between this second exemplary embodiment (
Plug connector units 116, 117, 117′, 117″ are selected in accordance with the representations in
In this third exemplary embodiment of the present invention, connector housing 215, similar to connector housing 15 of the first exemplary embodiment, is rotatably supported on the motor housing part 213 so as to be able to be latched in variously stepped angular positions. For this purpose, a baseplate 279 of an adapter 212 is fixedly screwed on motor housing part 213 using four screws. In addition, the lower side of lower shell 228 of connector housing 215 is provided with an annular projection 231, whose exterior diameter is smaller than the interior diameter of adapter 212 and therefore can be inserted into the adapter.
To achieve the axial, fixed, and rotatable connection of annular projection 231 of connector housing 216 on adapter 212 that is attached to motor housing part 213, a clamping ring 280 like a Seeger circlip ring is provided (
Inserting clamping ring 280 into annular groove 287 is accomplished from the position depicted in
Adapter 212, whose cylindrical part 291, projecting from baseplate 279, engages in annular projection 231, has an annular groove 292, whose base is provided with a toothing 293. If the end face of annular projection 231 rests on baseplate 279, which is screwed fixedly to motor housing part 213, then annular groove 292 that is provided with toothing 293 is located at the axial height of and is radially aligned with annular groove 287 of annular projection 231, and with its cutout 288 and 289. If clamping ring 280 from its pre-latching position (
It is then possible once again to rotate connector housing 215 with respect to adapter 212, i.e., motor housing part 213, if clamping ring 280 is pulled back opposite the direction of arrow D into its pre-latching position as depicted in
Beneath annular groove 292 that is provided with toothing 293, adapter 212 has a further annular groove, that is not depicted in detail, for receiving one or more sealing rings.
In the exemplary embodiments of plug connector device 11, 111, 211 depicted in the drawing, connector housing 15, 115, 215 is subdivided horizontally into a lower shell 28, 128, 228 and a cover shell 29, 129, 229. According to another undepicted exemplary embodiment of the present invention, the connector housing is subdivided in a vertical longitudinal plane such that the two connector housing parts, configured symmetrically or asymmetrically, can be brought together in the plane of the adapter or of the exterior surface of motor housing part 13, 113, 213. In this context, the plug connector units are preferably accommodated in one of the two connector housing parts, whereas the other connector housing part is empty and, if necessary, receives the area of the plug connector units that extends beyond the separating plane. In this exemplar embodiment, the adapter on its exterior circumferential side is provided with an annular undercut on one annular exterior circumference, into and over which the two connector housing parts can be slipped from the radial sides of the adapter. Both connector housing parts are rotatably but not detachably supported on the adapter.
In a further variant of this exemplary embodiment of the connector housing that is subdivided in a vertical plane, the plug connector units are either arranged, as in the depicted exemplary embodiments, in one horizontal plane next to each other, or they are arranged within one of the two connector housing parts one on top of the other, a horizontal separating wall that functions as an electromagnetic shield being arranged between the two plug connector units that are disposed one on top of the other.
Although particular embodiments of the invention have been described and illustrated herein, it is recognized that modifications and variations may readily occur to those skilled in the art, and consequently, it is intended that the claims be interpreted to cover such modifications and equivalents.